Abstract

Static and magic-angle spinning 11B nuclear magnetic resonance(NMR) data at 4.7 T and 8.5 T have been obtained under cryogenic conditions on a diluted sample of magnesium diboride powder in the normal and superconducting state. The data provide accurate information on the magnetic shift and longitudinal relaxation time down to a temperature of 8 K, with a resolution improvement over the entire temperature range. The onset of superconductivity is unaffected by the sample rotation, as revealed by a steep variation of the magnetic shift just below the critical temperature.

Received 01 June 2012Accepted 24 August 2012Published online 21 September 2012

Acknowledgments:

This research was supported by EPSRC (UK), Adventures in Research (University of Southampton, UK), the University Research Fellowship (Royal Society, UK) and the Estonian Science Foundation. M.C. would like to thank Ole Johannessen and Malcolm Levitt for discussion.